<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>后盾人</title>
  </head>
  <body></body>
  <script>
    let hd = {};
    hd.name = "后盾人";
    hd["age"] = 18;
    console.log(hd);
    delete hd.name;
    console.log(hd);

    console.log(hd.hasOwnProperty("age"));
  </script>
</html>
